[NH2:1][C:2]1[CH:7]=[C:6]([C:8]2[S:12][C:11]([CH2:13][C:14]([O:16]CC)=[O:15])=[N:10][C:9]=2[C:19]2[CH:24]=[CH:23][CH:22]=[C:21]([CH3:25])[CH:20]=2)[CH:5]=[CH:4][N:3]=1.[OH-].[Na+].Cl>C(O)C>[NH2:1][C:2]1[CH:7]=[C:6]([C:8]2[S:12][C:11]([CH2:13][C:14]([OH:16])=[O:15])=[N:10][C:9]=2[C:19]2[CH:24]=[CH:23][CH:22]=[C:21]([CH3:25])[CH:20]=2)[CH:5]=[CH:4][N:3]=1To a suspension of ethyl [5-(2-amino-4-pyridyl)-4-(3-methylphenyl)-1,3-thiazol-2-yl]acetate (7.00 g, 19.8 mmol) in ethanol (40 mL) was added 1N aqueous sodium hydroxide solution (40 mL), and the mixture was stirred at room temperature for 2 hrs. The reaction mixture was neutralized with 2N hydrochloric acid (20 mL) and the resulting solid was collected by filtration. The crude product was washed with water and dried to give the title compound (6.10 g, yield 95%).
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